Mount Weather Complex is a military facility located in Bluemont, Virginia. It contains a war room, including a high walkway, and a computer room, as well as numerous long corridors, crudely built into the mountainside.
In 2002, Fox Mulder infiltrated the facility known as Mount Weather with an access card provided to him by the Cigarette Smoking Man. There, he learned the date of the final Alien invasion in their re-colonization of planet Earth – December 22, 2012. Mulder's unauthorized presence was noticed by super-soldier Knowle Rohrer, who attempted to kill Mulder. Mulder led Rohrer on a chase that ended when Mulder threw Rohrer from great height onto power lines. Rohrer seemingly was killed but had, in fact, survived, as his alien essence meant that he was virtually invincible, with the exception of exposure to magnetite. (TXF: "The Truth")